maps come with the pokenav that you get from Devon corperation in rustboro and are usually at the right of Pokemon centers
You need to go to a Nintendo event for emerald. Unfortunatley, there are no more events for emerald anymore.
Put it in you ds and use action replay
By searching for Pokemon in the maps and then they might have items attached to them search in http://forums.tppc.info/viewforum.php?id=16 it has the answers :D
Go to professor oak, Talk to him, he will give you the "super itemfinder" use it when using the map
12 maps
No, but you just have to... wait depends what version I think I only have emerald so I don know but you have to use the HM flash to see better and then just look all around trust me I did that and I found it.
you have to go to maps and search
you have to get 10 ruby fragments from unowns in map 15, caverns of alph. Then you go to the research lab and it will have a button to push and the ten fragments turn into a ruby shard. Then you put it on you first pokemon and you go to the caverns of alph and keep clicking on the screen until you see moltres. When you battle moltres and beat him you get moltres.
When you find a Pokemon in the Maps, you can choose a PokeBall and try to capture it.
Elite four maps.
You can find Pokemon on the Maps.